JP2016034848A - Bag body, bag body manufacturing apparatus manufacturing bag body, bottom seal bar used for bag body manufacturing apparatus, and method for manufacturing bag body - Google Patents

Bag body, bag body manufacturing apparatus manufacturing bag body, bottom seal bar used for bag body manufacturing apparatus, and method for manufacturing bag body Download PDF

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JP2016034848A
JP2016034848A JP2014159162A JP2014159162A JP2016034848A JP 2016034848 A JP2016034848 A JP 2016034848A JP 2014159162 A JP2014159162 A JP 2014159162A JP 2014159162 A JP2014159162 A JP 2014159162A JP 2016034848 A JP2016034848 A JP 2016034848A
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line
film
seal
inclination
inner edge
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JP6409394B2 (en
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幸信 本屋敷
Yukinobu Motoyashiki
幸信 本屋敷
速人 稲部
Hayato Inabe
速人 稲部
石坂　公一
Koichi Ishizaka
公一 石坂
薫 小原
Kaoru Obara
薫 小原
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Toyo Seikan Group Holdings Ltd
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Toyo Seikan Kaisha Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a bag body capable of reducing an adjustment amount of a position of a mountain fold line of a bottom film with respect to change in a position of an intersection point between an inside edge line of a side seal portion and an inside edge line of a bottom seal portion as much as possible.SOLUTION: A bag body has: a surface side film 11; a back side film 12; and a bottom film 13 which is folded into two and sandwiched between the surface side film 11 and the back side film 12. An inside edge line 26 of a bottom seal portion 25 has: a rising inclination line portion 261 rising from a central portion toward the outside in a width direction of a bottom film 13; and an inclination relaxation line portion 262 which continues into the rising inclination line portion 261. Inclination of a tangent in each point of the inclination relaxation line portion 262 is smaller than inclination of a tangent of a connection portion between the rising inclination line portion 261 and the inclination relaxation line portion 262. An inside edge line 22a of a side seal portion 21a has such a structure as to intersect with the inside edge line 26 of the bottom seal portion 25 on the inclination relaxation line portion 262.SELECTED DRAWING: Figure 7

Description

本発明は、表側フィルムと、裏側フィルムと、該表側フィルムと該裏側フィルムとの間に２つ折りにして挟まれた底フィルムとを有する自立型パウチ等の袋体、その袋体を製造する袋体製造装置、その袋体製造装置に用いられる底シールバー及び前記袋体の製造方法に関する。   The present invention relates to a bag body such as a self-supporting pouch having a front side film, a back side film, and a bottom film sandwiched between the front side film and the back side film, and a bag for manufacturing the bag body The present invention relates to a body manufacturing apparatus, a bottom seal bar used in the bag manufacturing apparatus, and a method for manufacturing the bag body.

スープ類、液体調味料、液体洗剤等の容器として自立型パウチ（袋体）が知られている（例えば、特許文献１〜３参照）。この種の自立型パウチは、図１に示すように、表側フィルム１１と、裏側フィルム１２と、表側フィルム１１と裏側フィルム１２との間に２つ折りにして挟まれた底フィルム１３とからなっている。表側フィルム１１、裏側フィルム１２及び底フィルム１３のそれぞれは、基材層と、熱接着性を有するヒートシール層とが積層されたプラスチックフィルムで形成されている。   Self-supporting pouches (bags) are known as containers for soups, liquid seasonings, liquid detergents and the like (for example, see Patent Documents 1 to 3). As shown in FIG. 1, this type of self-standing pouch includes a front film 11, a back film 12, and a bottom film 13 sandwiched between the front film 11 and the back film 12. Yes. Each of the front side film 11, the back side film 12, and the bottom film 13 is formed of a plastic film in which a base material layer and a heat seal layer having thermal adhesiveness are laminated.

そして、表側フィルム１１と裏側フィルム１２とがそれぞれヒートシール層が対向するように配置され、ヒートシール層を外側にして２つ折りにされた底フィルム１３の折り片１３ａと折り片１３ｂとが、それぞれ表側フィルム１１と裏側フィルム１２との間に対向するように、当該底フィルム１３の山折り線１３ｃを上側にした状態で配置される。この状態で、表側フィルム１１、底フィルム１３（折り片１３ａ、１３ｂ）及び裏側フィルム１２を加圧加熱することにより、図２に示すように、表側フィルム１１と底フィルム１３の一方の折り片１３ａ、裏側フィルム１２と底フィルム１３の他方の折り片１３ｂとがそれぞれシールされて、所定形状（凹椀形状）の底シール部２３ａ、２３ｂが形成される。また、表側フィルム１１及び裏側フィルム１２の両サイドもそれぞれ加圧加熱することにより、両サイドが所定幅ｗにてシールされて所定形状（所定幅の直線形状あるいは曲線形状など）のサイドシール部２１ａ、２１ｂが形成される。   And the front side film 11 and the back side film 12 are arrange | positioned so that a heat-seal layer may oppose, respectively, The fold piece 13a and the fold piece 13b of the bottom film 13 folded by making the heat-seal layer the outside, respectively, It arrange | positions in the state which turned up the mountain fold line 13c of the said bottom film 13 so that it might oppose between the front side film 11 and the back side film 12. FIG. In this state, the front side film 11, the bottom film 13 (folded pieces 13a, 13b) and the back side film 12 are heated under pressure, so that one folded piece 13a of the front side film 11 and the bottom film 13 as shown in FIG. The back film 12 and the other folded piece 13b of the bottom film 13 are respectively sealed to form bottom seal portions 23a and 23b having a predetermined shape (concave shape). Further, both sides of the front film 11 and the back film 12 are pressurized and heated, respectively, so that both sides are sealed with a predetermined width w, and a side seal portion 21a having a predetermined shape (a linear shape or a curved shape with a predetermined width). , 21b are formed.

このようにして、２つ折りした状態の底フィルム１３と表側フィルム１１及び裏側フィルム１２のそれぞれとをシールして形成された底シール部２３（２３ａ、２３ｂ）と、表側フィルム１１及び裏側フィルム１２の両サイドをシールして形成されたサイドシール部２１ａ、２１ｂとによって、上端部が開放した袋状の自立型パウチ１０が形成される。この自立型パウチ１０は、図３に示すように、２つ折り状態の底フィルム１３が開くことにより自立する。   Thus, the bottom seal part 23 (23a, 23b) formed by sealing the bottom film 13 in a folded state and the front film 11 and the back film 12, respectively, and the front film 11 and the back film 12 A bag-like self-standing pouch 10 having an open upper end is formed by side seal portions 21a and 21b formed by sealing both sides. As shown in FIG. 3, the self-supporting pouch 10 is self-supporting when the bottom-folded film 13 is opened.

前述した自立型パウチ１０は、具体的には、例えば、図４に示すようにして製造される。   Specifically, the above-described self-standing pouch 10 is manufactured, for example, as shown in FIG.

自立型パウチ１０の基材となるプラスチックフィルムの原反から切り出された表用長尺フィルム１０１（表側フィルム１１に対応）と裏用長尺フィルム１０２（裏側フィルム１２に対応）との間に、同様のプラスチックフィルムを２つ折りした底用長尺フィルム１０３（底フィルム１３に対応）が挟まれた状態で、それら表用長尺フィルム１０１、裏用長尺フィルム１０２及び底用長尺フィルム１０３が順次搬送される。この状態で、一対の底シールバー（５０ａ、５０ｂ）（図４に示す例では、パウチ２個取り用）が、表用長尺フィルム１０１、裏用長尺フィルム１０２及び底用長尺フィルム１０３の所定部位を挟み込んで、それらを加圧加熱してシールすることにより、所定形状の底シール部（図２における底シール部２３（２３ａ、２３ｂ）に対応）が形成される（底シール工程）。   Between the front long film 101 (corresponding to the front side film 11) and the back long film 102 (corresponding to the back side film 12) cut out from the raw film of the plastic film which becomes the base material of the self-standing pouch 10, In the state where the long film 103 for the bottom (corresponding to the bottom film 13) obtained by folding the same plastic film is sandwiched, the long film 101 for the front, the long film 102 for the back, and the long film 103 for the bottom are It is conveyed sequentially. In this state, the pair of bottom seal bars (50a, 50b) (in the example shown in FIG. 4, for taking two pouches) are the front long film 101, the back long film 102, and the bottom long film 103. Are sealed by pressurizing and heating them to form a bottom seal portion (corresponding to the bottom seal portions 23 (23a and 23b) in FIG. 2) (bottom seal step). .

底シールバー５０ａ、５０ｂの下流側に、各長尺フィルム１０１、１０２、１０３を横切るように延びる２対のサイドシールバー（５１ａ、５１ｂ）、（５２ａ、５２ｂ）が、形成されるべき自立型パウチ１０の幅に相当する間隔をもって配置されている。この各サイドシールバー対（５１ａ、５１ｂ）、（５２ａ、５２ｂ）が、表用長尺フィルム１０１及び裏用長尺フィルム１０２を加圧加熱してシールすることにより、所定幅のサイドシール部（図２における幅Ｗのサイドシール部２１ａ、２１ｂの２倍の幅２ｗ）が形成される（サイドシール工程）。そして、２対のサイドシールバー（５１ａ、５１ｂ）、（５２ａ、５２ｂ）の下流側に配置されたカッター装置５３によってサイドシール部分をカットすることにより、前述した構造（図１〜図３参照）の自立型パウチ１０が切り出される（カッター工程）。   Two pairs of side seal bars (51a, 51b), (52a, 52b) extending so as to cross the respective long films 101, 102, 103 are formed on the downstream side of the bottom seal bars 50a, 50b. The pouches 10 are arranged with an interval corresponding to the width of the pouch 10. Each pair of side seal bars (51a, 51b), (52a, 52b) pressurizes and heats the front long film 101 and the back long film 102 to seal a side seal portion having a predetermined width ( 2 is formed (width 2w) that is twice the width W of the side seal portions 21a and 21b in FIG. 2 (side seal process). And the structure mentioned above by cutting a side seal part with the cutter apparatus 53 arrange | positioned downstream of two pairs of side seal bar | burr (51a, 51b), (52a, 52b) (refer FIGS. 1-3). The self-standing pouch 10 is cut out (cutter process).

特開２００１−１１４２９６号公報JP 2001-114296 A 特開２００１−２０６３８４号公報JP 2001-206384 A 特開２００４−１３６４９３号公報JP 2004-136493 A

このような自立型パウチ１０（袋体）において、サイドシール部２１ａ（２１ｂ）の内側縁線２２ａ（２２ｂ）と底シール部２３ａ（２３ｂ）の内側縁線２４ａ（２４ｂ）との交点Ｐａ（Ｐｂ）と、底フィルム１３の山折り線１３ｃとの位置関係は、落下強度や底部分（底フィルム１３による）の形状の良否の観点から重要である。そして、底フィルム１３の山折り線１３ｃの位置は、サイドシール部２１ａ（２１ｂ）の内側縁線２２ａ（２２ｂ）と、底シール部２３ａ（２３ｂ）の内側縁線２４ａ（２４ｂ）との交点Ｐａ（Ｐｂ）を基準にして決められる。例えば、底フィルム１３の山折り線１３ｃは、サイドシール部２１ａ（２１ｂ）の内側縁線２２ａ（２２ｂ）と、底シール部２３ａ（２３ｂ）の内側縁線２４ａ（２４ｂ）との交点Ｐａ（Ｐｂ）を通っていることが好ましく、少なくともパウチの高さ方向のある範囲内にあることが必要である。この範囲外になるとパウチの落下強度が不足し、パウチが落下したときに内容物が漏洩するおそれがあり、また、パウチの底シール形状の美観を損ねるおそれがある。   In such a self-standing pouch 10 (bag), the intersection Pa (Pb) between the inner edge line 22a (22b) of the side seal portion 21a (21b) and the inner edge line 24a (24b) of the bottom seal portion 23a (23b). ) And the mountain fold line 13c of the bottom film 13 is important from the viewpoint of the drop strength and the shape of the bottom portion (by the bottom film 13). And the position of the mountain fold line 13c of the bottom film 13 is the intersection Pa of the inner edge line 22a (22b) of the side seal part 21a (21b) and the inner edge line 24a (24b) of the bottom seal part 23a (23b). It is determined based on (Pb). For example, the mountain fold line 13c of the bottom film 13 is an intersection Pa (Pb) between the inner edge line 22a (22b) of the side seal portion 21a (21b) and the inner edge line 24a (24b) of the bottom seal portion 23a (23b). ), And at least within a certain range in the height direction of the pouch. If it falls outside this range, the drop strength of the pouch will be insufficient, the contents may leak when the pouch falls, and the aesthetic appearance of the bottom seal shape of the pouch may be impaired.

さらに、前述した自立型パウチ１０（袋体）に使用される表用長尺フィルム１０１及び裏用長尺フィルム１０２には、絵柄等が連続的に印刷されており、底シールバー５０ａ、５０ｂ及び２対のサイドシールバー（５１ａ、５１ｂ）、（５２ａ、５２ｂ）は、各自立パウチ１０に製袋する際に、図柄にはみだし部分や欠け部分が無いようにセットされる。   Further, the front long film 101 and the back long film 102 used in the above-described self-supporting pouch 10 (bag body) are continuously printed with patterns and the like, and bottom seal bars 50a, 50b, The two pairs of side seal bars (51a, 51b), (52a, 52b) are set so that there are no protruding parts or chipped parts in the pattern when each self-standing pouch 10 is made.

一方、表用長尺フィルム１０１及び裏用長尺フィルム１０２が切り出されるプラスチックフィルムの原反は、温度、湿度、巻取り張力等の影響を受けて、搬送方向、即ち、製袋される自立型パウチ１０の幅方向に伸縮する。このため、例えば、図５に示すように、サイドシール部２１ａの内側縁線２２ａ（１）と底シール部２３の内側縁線２４とが点Ｐａ（１）で交差するように２対のサイドシールバー（５１ａ、５１ｂ）、（５２ａ、５２ｂ）をセットしてパウチの製造を続けると、前述したプラスチックフィルムの原反（表用長尺フィルム１０１、裏用長尺フィルム１０２）の収縮に起因して、絵柄に対するサイドシール部２１ａ（２１ｂ）のずれが製品としての許容範囲を越えてしまうことがある。このような場合、サイドシールバー対（５１ａ、５１ｂ）、（５２ａ、５２ｂ）を、サイドシール部２１ａの内側縁線が２２ａ（２）の位置になるように再セットすることが考えられる。しかしながらこのように再セットすると、サイドシール部２１ａの内側縁線２２ａ（２）と底シール部２３の内側縁線２４との交点が点Ｐａ（２）に変化する。そして、この交点の変化により、サイドシール部２１ａの内側縁線２２ａ（１）と底シール部２３の内側縁線２４との交点Ｐａ（１）を通っていた底フィルム１３の山折り線１３ｃ（１）が、再セット後にサイドシール部２１ａの内側縁線２２ａ（２）と底シール部２３の内側縁線２４との交点Ｐａ（２）を通らなくなる。このため、山折り線１３ｃ（１）と交点Ｐａ（２）との間にパウチ高さ方向のずれが生じる結果となる。   On the other hand, the original film of the plastic film from which the front long film 101 and the back long film 102 are cut out is influenced by temperature, humidity, winding tension, and the like, in the conveying direction, that is, a self-supporting type in which bags are made. The pouch 10 expands and contracts in the width direction. For this reason, for example, as shown in FIG. 5, two pairs of sides such that the inner edge line 22a (1) of the side seal portion 21a and the inner edge line 24 of the bottom seal portion 23 intersect at a point Pa (1). If the manufacture of the pouch is continued by setting the seal bars (51a, 51b), (52a, 52b), it is caused by the shrinkage of the plastic film (the front long film 101 and the back long film 102). And the shift | offset | difference of the side seal part 21a (21b) with respect to a pattern may exceed the tolerance | permissible_range as a product. In such a case, it is conceivable to reset the pair of side seal bars (51a, 51b) and (52a, 52b) so that the inner edge line of the side seal portion 21a is positioned at 22a (2). However, when resetting in this way, the intersection of the inner edge line 22a (2) of the side seal portion 21a and the inner edge line 24 of the bottom seal portion 23 changes to a point Pa (2). Then, due to the change in the intersection point, the mountain fold line 13c of the bottom film 13 that passes through the intersection point Pa (1) between the inner edge line 22a (1) of the side seal portion 21a and the inner edge line 24 of the bottom seal portion 23 ( 1) does not pass through the intersection Pa (2) between the inner edge line 22a (2) of the side seal portion 21a and the inner edge line 24 of the bottom seal portion 23 after resetting. For this reason, it results in a shift in the pouch height direction between the mountain fold line 13c (1) and the intersection Pa (2).

そして、このようなずれは、前述したように、パウチの落下強度、パウチ底シール形状の美観の観点から好ましくない。このため、２つ折りした底フィルム１３（底用長尺フィルム１０３）の表側フィルム１１（表用長尺フィルム１０１）と、裏側フィルム１２（裏用長尺フィルム１０２）との間への差し込み量を調整して、底フィルム１３の山折り線１３ｃがサイドシール部２１ａの内側縁線２２ａ（２）と底シール部２３の内側縁線２４との交点Ｐａ（２）を通るようにしなければならない。即ち、底フィルム１３の山折り線が線１３ｃ（２）の位置になるようにしなければならない。しかしながら、このような底フィルム１３（底用長尺フィルム１０３）の差し込みの調整作業は煩わしく、生産性の低下の原因となる。また、その調整量（変化量）が大きくなると、製造される自立型パウチ１０の内容量の変化も大きくなり、甚だしい場合には内容量不足になるおそれもある。   Such a shift is not preferable from the viewpoint of the drop strength of the pouch and the aesthetic appearance of the pouch bottom seal shape as described above. For this reason, the amount of insertion between the front film 11 (front long film 101) and the back film 12 (back long film 102) of the folded bottom film 13 (long long film 103) is reduced. It is necessary to adjust so that the mountain fold line 13c of the bottom film 13 passes through the intersection Pa (2) between the inner edge line 22a (2) of the side seal portion 21a and the inner edge line 24 of the bottom seal portion 23. That is, the mountain fold line of the bottom film 13 must be positioned at the line 13c (2). However, such an adjustment operation for inserting the bottom film 13 (long bottom film 103) is troublesome and causes a decrease in productivity. In addition, when the adjustment amount (change amount) increases, the change in the internal capacity of the self-standing pouch 10 to be manufactured also increases, and in a severe case, the internal capacity may be insufficient.

本発明は、このような事情に鑑みてなされたもので、サイドシール部の内側縁線と底シール部の内側縁線との交点の位置の変化に対して、底フィルムの山折り線の位置の調整量を小さくすることが可能な袋体を提供するものである。   The present invention has been made in view of such circumstances, and the position of the mountain fold line of the bottom film with respect to the change in the position of the intersection of the inner edge line of the side seal portion and the inner edge line of the bottom seal portion. A bag body capable of reducing the adjustment amount is provided.

また、本発明は、前記した袋体の製造に適した袋体製造装置を提供し、また、前記袋体製造装置に用いられる底シールバーを提供し、更に、前記袋体の製造に適した製造方法を提供するものである。   In addition, the present invention provides a bag manufacturing apparatus suitable for manufacturing the above-described bag body, provides a bottom seal bar used in the bag body manufacturing apparatus, and further suitable for manufacturing the bag body. A manufacturing method is provided.

本発明に係る袋体は、表側フィルムと、裏側フィルムと、該表側フィルムと該裏側フィルムとの間に２つ折りして挟まれた底フィルムとを有し、２つ折りした状態の前記底フィルムと前記表側フィルム及び前記裏側フィルムのそれぞれとをシールして形成される所定形状の底シール部と、前記表側フィルム及び前記裏側フィルムの両サイドのそれぞれをシールして形成された所定形状のサイドシール部とによって袋状に形成された袋体であって、前記底シール部の内側縁線は、前記底フィルムの幅方向における中央部から外側に向かって立ち上がる立ち上がり傾斜線部と、前記立ち上がり傾斜線部に続く傾斜緩和線部とを有し、該傾斜緩和線部の各点での接線の前記中央部から外側に向かう方向の傾きは、前記立ち上がり傾斜線部と当該傾斜緩和線部との接続点での接線の前記中央部から外側に向う方向の傾きより小さく、前記サイドシール部の内側縁線は、前記底シール部の前記内側縁線と、前記傾斜緩和線部において交差する構成となる。   The bag according to the present invention has a front film, a back film, and a bottom film sandwiched between the front film and the back film, and the bottom film in a folded state. A bottom seal portion having a predetermined shape formed by sealing each of the front side film and the back side film, and a side seal portion having a predetermined shape formed by sealing both sides of the front side film and the back side film. The inner edge line of the bottom seal portion is a rising slope line portion that rises outward from the center portion in the width direction of the bottom film, and the rising slope line portion. An inclination relaxation line portion that follows, and the inclination of the tangent line at each point of the inclination relaxation line portion in the direction from the center to the outside is the rising inclination line portion and the inclination The inner edge line of the side seal part is smaller than the inclination of the tangent line at the connection point with the sum line part in the direction from the center to the outer side, the inner edge line of the bottom seal part, and the inclined relaxation line part. It becomes the structure which crosses in.

このような構成により、サイドシール部の内側縁線が、底フィルムの中心部から外側に向かって立ち上がる立ち上がり傾斜線部に続く比較的傾きが小さい傾斜緩和線部において底シール部の内側縁線と交差するので、サイドシール部の内側縁線の位置の変化に起因して当該サイドシール部の内側縁線と底シール部の内側縁線との交点の位置が変化したとしても、その交点と底フィルムの山折り線との間の間隔長の変化は、前記傾斜緩和線部の比較的小さい傾きに応じた程度の変化に抑えられる。   With such a configuration, the inner edge line of the side seal portion and the inner edge line of the bottom seal portion in the inclination relaxation line portion that has a relatively small inclination following the rising slope line portion that rises outward from the center portion of the bottom film. Therefore, even if the position of the intersection between the inner edge line of the side seal portion and the inner edge line of the bottom seal portion changes due to the change in the position of the inner edge line of the side seal portion, the intersection point and the bottom The change in the distance between the film and the mountain fold line can be suppressed to a change corresponding to the relatively small inclination of the inclination relaxation line portion.

本発明に係る袋体において、前記立ち上がり傾斜線部は、凹形状であり、前記傾斜緩和線部は、前記凹形状の立ち上がり傾斜線部に滑らかに続く凸形状の第１線部を有する構成とすることができる。   In the bag according to the present invention, the rising slope line portion has a concave shape, and the inclination relaxation line portion has a convex first line portion that smoothly follows the concave rising slope line portion. can do.

また、本発明に係る袋体において、前記傾斜緩和線部は、更に、前記第１線部に滑らかに続く凹形状の第２線部を有する構成とすることができる。   Moreover, the bag body which concerns on this invention WHEREIN: The said inclination relaxation line part can be set as the structure which has a concave 2nd line part which follows the said 1st line part smoothly.

前記第１線部と前記第２線部との接続点での接線の傾きがゼロであるように構成することができ、その場合、前記サイドシール部の前記内側縁線は、前記底シール部の前記内側縁線と、前記傾斜緩和線部の前記第１線部と前記第２線部との接続点及びその所定近傍において交差する構成とすることができる。   The inclination of the tangent line at the connection point between the first line portion and the second line portion can be configured to be zero. In this case, the inner edge line of the side seal portion is the bottom seal portion. The inner edge line, and the connection point between the first line part and the second line part of the inclined relaxation line part and a predetermined vicinity thereof may be used.

このような構成により、サイドシール部の内側縁線と底シール部の内側縁線との交点が、前記傾斜緩和線部において傾きがゼロとなる凸形状の第１線部と凸形状の第２線部との接続点及びその所定近傍に制限されるので、サイドシール部の内側縁線の位置の変化に起因して当該サイドシール部の内側縁線と底シール部の内側縁線との交点の位置が変化したとしても、その交点と底フィルムの山折り線との間の間隔長の変化は、更に小さく抑えることができる。   With such a configuration, the intersection between the inner edge line of the side seal portion and the inner edge line of the bottom seal portion is a convex first line portion and a convex second shape where the inclination is zero in the inclination relaxation line portion. Because it is limited to the connection point with the line part and its predetermined vicinity, the intersection of the inner edge line of the side seal part and the inner edge line of the bottom seal part due to the change in the position of the inner edge line of the side seal part Change in the distance between the intersection and the bottom fold line of the bottom film can be further reduced.

本発明に係る袋体において、前記第１線部は、第１曲率半径を有する円弧状であり、前記第２線部は、前記第１曲率半径より小さい第２曲率半径を有する円弧状である構成とすることができる。   In the bag according to the present invention, the first line portion has an arc shape having a first radius of curvature, and the second line portion has an arc shape having a second radius of curvature smaller than the first radius of curvature. It can be configured.

また、本発明に係る袋体製造装置は、前述したいずれかの袋体を製造する袋体製造装置であって、前記袋体の前記底シール部を形成する底シールバーと、前記袋体の前記サイドシール部を形成するサイドシールバーとを有し、前記底シールバーは、前記底シール部の前記立ち上がり傾斜線部に対応する立ち上がり傾斜シール線部と、該立ち上がり傾斜シール線部に続く前記底シール部の前記傾斜緩和線部に対応する傾斜緩和シール線部とを有し、前記サイドシールバーは、当該サイドシールバーにて形成される前記袋体における前記サイドシール部の内側縁線が、前記底シールバーにて形成される前記底シール部の内側縁線と、前記傾斜緩和線部にて交差するようにセットされる構成となる。   Moreover, the bag body manufacturing apparatus according to the present invention is a bag body manufacturing apparatus for manufacturing any one of the bag bodies described above, and includes a bottom seal bar that forms the bottom seal portion of the bag body, and the bag body. A side seal bar that forms the side seal portion, and the bottom seal bar is a rising inclined seal line portion corresponding to the rising inclined line portion of the bottom seal portion, and the rising inclined seal line portion following the rising inclined seal line portion. An inclination relaxation seal line portion corresponding to the inclination relaxation line portion of the bottom seal portion, and the side seal bar has an inner edge line of the side seal portion in the bag body formed by the side seal bar. The inner edge line of the bottom seal part formed by the bottom seal bar is set so as to intersect at the inclined relaxation line part.

前記袋体製造装置に用いられる底シールバーは、前記袋体の前記底シール部の前記立ち上がり傾斜線部に対応する立ち上がり傾斜シール線部と、該立ち上がり傾斜シール線部に続く前記底シール部の前記傾斜緩和線部に対応する傾斜緩和シール線部とを有する構成となる。   The bottom seal bar used in the bag body manufacturing apparatus includes a rising inclined seal line portion corresponding to the rising inclined line portion of the bottom seal portion of the bag body, and a bottom seal portion following the rising inclined seal line portion. It becomes the structure which has the inclination relaxation seal line part corresponding to the said inclination relaxation line part.

また、本発明に係る袋体の製造方法は、表側フィルムと、裏側フィルムと、該表側フィルムと該裏側フィルムとの間に２つ折りして挟まれた底フィルムとを有する袋体を製造する方法であって、２つ折りした状態の前記底フィルムと前記表側フィルム及び前記裏側フィルムのそれぞれとをシールして所定形状の底シール部を形成する底シール工程と、前記表側フィルム及び前記裏側フィルムの両サイドのそれぞれをシールして所定形状のサイドシール部を形成するサイドシール工程とを有し、前記底シール工程は、内側縁線が、前記底フィルムの幅方向における中央部から外側に向かって立ち上がる立ち上がり傾斜線部と、前記立ち上がり傾斜線部に続く傾斜緩和線部とを有し、該傾斜緩和線部の各点での接線の前記中央部から外側に向かう方向の傾きが前記立ち上がり傾斜線部と当該傾斜緩和線部との接続点での接線の前記中央部から外側に向かう方向の傾きより小さい前記底シール部を形成し、前記サイドシール工程は、内側縁線が、前記底シール部の前記内側縁線と、前記傾斜緩和線部において交差する前記サイドシール部を形成する構成となる。   Moreover, the manufacturing method of the bag which concerns on this invention is the method of manufacturing the bag which has a front side film, a back side film, and the bottom film pinched | folded between the front side film and the back side film. A bottom sealing step of sealing the bottom film in a folded state and the front side film and the back side film to form a bottom seal portion having a predetermined shape, and both the front side film and the back side film. Each of the sides is sealed to form a side seal portion having a predetermined shape. In the bottom seal step, the inner edge line rises outward from the center in the width direction of the bottom film. It has a rising slope line part and an inclination relaxation line part following the rising slope line part, and goes outward from the central part of the tangent at each point of the slope relaxation line part Forming the bottom seal portion whose inclination of the direction is smaller than the inclination in the direction from the central portion toward the outside of the tangent line at the connection point between the rising slope line portion and the slope relaxation line portion; An edge line forms the side seal part that intersects the inner edge line of the bottom seal part at the inclined relaxation line part.

本発明に係る袋体によれば、サイドシール部の内側縁線の位置の変化に起因して、当該サイドシール部の内側縁線と底シール部の内側縁線との交点の位置が変化しても、その交点と底フィルムの山折り線との間の間隔長の変化は、前記傾斜緩和線部の小さい傾きに応じた程度の変化に抑えられ、サイドシール部の内側縁線と底シール部の内側縁線との交点の変化に対する底フィルムの山折り線の位置の調整量を小さくすることができる。   According to the bag according to the present invention, due to the change in the position of the inner edge line of the side seal portion, the position of the intersection of the inner edge line of the side seal portion and the inner edge line of the bottom seal portion changes. However, the change in the length of the gap between the intersection and the bottom fold line of the bottom film is suppressed to a change according to the small inclination of the inclined relaxation line portion, and the inner edge line of the side seal portion and the bottom seal The amount of adjustment of the position of the mountain fold line of the bottom film with respect to the change of the intersection with the inner edge line of the part can be reduced.

また、本発明に係る袋体製造装置、底シールバー及び袋体の製造方法によれば、前述した袋体を、生産性を低下させることなく製造することができる。   Moreover, according to the bag body manufacturing apparatus, the bottom seal bar, and the bag body manufacturing method according to the present invention, the above-described bag body can be manufactured without reducing productivity.

自立型パウチを構成する表側フィルム、裏側フィルム及び底フィルムを示す図である。It is a figure which shows the front side film, back side film, and bottom film which comprise a self-supporting type pouch. 図１に示す表側フィルム、裏側フィルム及び底フィルムにより形成される自立型パウチの一例を示す正面図である。It is a front view which shows an example of the self-supporting type pouch formed with the front side film, back side film, and bottom film which are shown in FIG. 図２に示す自立型パウチの底を示す図である。It is a figure which shows the bottom of the self-supporting type pouch shown in FIG. 自立型パウチの製造工程を示す図である。It is a figure which shows the manufacturing process of a self-supporting type pouch. 図２に示す自立型パウチにおけるサイドシール部の内側縁線、底シール部の内側縁線及び底フィルムの山折り線との関係を示す図である。It is a figure which shows the relationship with the inner edge line of the side seal part in the self-supporting type pouch shown in FIG. 2, the inner edge line of the bottom seal part, and the mountain fold line of the bottom film. 本発明の実施の形態に係る袋体である自立型パウチを示す正面図である。It is a front view which shows the self-supporting type pouch which is a bag which concerns on embodiment of this invention. 図６に示す自立型パウチにおけるサイドシール部の内側縁線、底シール部の内側縁線及び底フィルムの山折り線との関係を示す図である。It is a figure which shows the relationship between the inner edge line of the side seal part in the self-supporting type pouch shown in FIG. 6, the inner edge line of the bottom seal part, and the mountain fold line of the bottom film. 図６に示す自立型パウチを製造する装置における底シールバーを示す正面図である。It is a front view which shows the bottom seal bar in the apparatus which manufactures the self-supporting type pouch shown in FIG. 図８に示す底シールバーの片側部分を拡大して示す図である。It is a figure which expands and shows the one side part of the bottom seal bar shown in FIG. サイドシール部の内側縁線の変化に対する底フィルムの山折り線の調整範囲（その１）を従来の例と比較して示す図である。It is a figure which shows the adjustment range (the 1) of the mountain fold line of a bottom film with respect to the change of the inner edge line of a side seal part compared with the conventional example. サイドシール部の内側縁線の変化に対する底フィルムの山折り線の調整範囲（その２）を従来の例と比較して示す図である。It is a figure which shows the adjustment range (the 2) of the mountain fold line of a bottom film with respect to the change of the inner edge line of a side seal part compared with the conventional example.

本発明の実施の形態について図面を用いて説明する。   Embodiments of the present invention will be described with reference to the drawings.

本発明の実施の一形態に係る袋体は、図６及び図７に示すように構成され、この袋体は、前述した自立型パウチと同様のパウチである。なお、図６は、その自立型パウチを示す正面図であり、図７は、図６に示す自立型パウチにおけるサイドシール部の内側縁線、底シール部の内側縁線及び底フィルムの山折り線との関係を示す図である。   A bag body according to an embodiment of the present invention is configured as shown in FIGS. 6 and 7, and this bag body is a pouch similar to the self-standing pouch described above. 6 is a front view showing the self-supporting pouch, and FIG. 7 is an inner edge line of the side seal portion, an inner edge line of the bottom seal portion, and a mountain fold of the bottom film in the self-supporting pouch shown in FIG. It is a figure which shows the relationship with a line.

本実施形態に係る自立型パウチ１０は、図６に示すように、２つ折りした底フィルム１３（折り片１３ａ、１３ｂ：図１参照）と表側フィルム１１及び裏側フィルム１２とをシールして形成される所定形状の底シール部２５（２５ａ、２５ｂ）と、表側フィルム１１及び裏側フィルム１２の両サイドを所定幅ｗにてシールして形成されたサイドシール部２１ａ、２１ｂとによって形成されている。   As shown in FIG. 6, the self-standing pouch 10 according to the present embodiment is formed by sealing a folded bottom film 13 (folded pieces 13a and 13b: see FIG. 1), a front film 11 and a back film 12. The bottom seal part 25 (25a, 25b) having a predetermined shape and the side seal parts 21a, 21b formed by sealing both sides of the front film 11 and the back film 12 with a predetermined width w are formed.

そして、自立型パウチ１０における底フィルム１３の山折り線１３ｃの位置関係は、前述した従来の自立型パウチ１０と同様である（図２参照）。また、図６に示すように、底シール部２５（内側縁線２６）の形状は、底フィルム１３の幅方向における中心線Ｃに対して対称である。   And the positional relationship of the mountain fold line 13c of the bottom film 13 in the self-supporting pouch 10 is the same as that of the conventional self-supporting pouch 10 described above (see FIG. 2). Further, as shown in FIG. 6, the shape of the bottom seal portion 25 (inner edge line 26) is symmetric with respect to the center line C in the width direction of the bottom film 13.

自立型パウチ１０の底シール部２５の内側縁線２６は、図６及び図７に示すように、底フィルム１３の幅方向の中央部Ｃから外側Ｄoutに向かって立ち上がる凹形状の立ち上がり傾斜線部２６１（中心部Ｃから幅方向における区間Ｓ１に対応）、立ち上がり傾斜線部２６１に続く傾斜緩和線部２６２（幅方向における区間Ｓ２に対応）、傾斜緩和線部２６２から続いて自立型パウチ１０の側端縁（サイドシール部２１ａの外側縁）に至る端線部２６３（幅方向における区間Ｓ３に対応）から形成されている。そして、傾斜緩和線部２６２の各点での傾き（各点での接線の前記中央部Ｃから外側Ｄoutに向かう方向の傾き：以下同様）は、底フィルム１３の中央部Ｃから徐々に傾きが大きくなっている立ち上がり傾斜線部２６１と当該傾斜緩和線部２６２との接続点ＰCNでの傾き（接続点ＰCNでの接線の前記中央部Ｃから外側Ｄoutに向かう方向の傾き：以下同様）より小さい。   As shown in FIGS. 6 and 7, the inner edge line 26 of the bottom seal portion 25 of the self-standing pouch 10 is a concave rising slope line portion that rises from the center portion C in the width direction of the bottom film 13 toward the outer side Dout. 261 (corresponding to the section S1 in the width direction from the center C), the slope relaxation line part 262 (corresponding to the section S2 in the width direction) following the rising slope line part 261, and the slope relaxation line part 262 following the slope relaxation line part 262. It is formed from an end line portion 263 (corresponding to the section S3 in the width direction) reaching the side end edge (the outer edge of the side seal portion 21a). And the inclination at each point of the inclination relaxation line part 262 (inclination in the direction from the central part C toward the outside Dout of the tangent at each point: the same applies hereinafter) is gradually inclined from the central part C of the bottom film 13. Less than the slope at the connection point PCN between the rising slope line part 261 and the slope relaxation line part 262 that is larger (the slope in the direction from the center C to the outside Dout of the tangent line at the connection point PCN: the same applies hereinafter). .

傾斜緩和線部２６２は、凹形状の立ち上がり傾斜線部２６１に滑らかに続く凸形状の第１線部２６２ａ（幅方向における区間Ｓ２ａに対応）と、第１線部２６２ａに滑らかに続く凹形状の第２線部２６２ｂ（幅方向における区間Ｓ２ｂに対応）とから形成されている。一方、凹形状の立ち上がり傾斜線部２６１は、曲率半径Ｒ1の円弧状（それに続く直線部を含んでもよい）であり、立ち上がり傾斜線部２６１に滑らかに続く第１線部２６２ａは、前記曲率半径Ｒ1より小さい曲率半径Ｒ2（例えば、曲率半径Ｒ1の１／３〜１／８程度）の円弧状である。また、第１線部２６２ａに滑らかに続く第２線部２６２ｂは、前記曲率半径Ｒ2より更に小さい曲率半径Ｒ3（例えば、曲率半径Ｒ2の１／２〜１／６程度）の円弧状であることが好ましい。さらに、傾斜緩和線部２６２において、第１線部２６２ａと第２線部２６２ｂとの接続点での傾き（接続点での接線の傾き）はゼロ（幅方向と平行）になっている。   The slope relaxation line part 262 includes a convex first line part 262a (corresponding to the section S2a in the width direction) smoothly following the concave rising slope line part 261, and a concave shape smoothly following the first line part 262a. The second line portion 262b (corresponding to the section S2b in the width direction) is formed. On the other hand, the concave rising slope line part 261 has an arc shape with a radius of curvature R1 (may include a straight line part that follows), and the first line part 262a smoothly following the rising slope line part 261 has the curvature radius. It has an arc shape with a radius of curvature R2 smaller than R1 (for example, about 1/3 to 1/8 of the radius of curvature R1). The second line portion 262b smoothly following the first line portion 262a has an arc shape having a curvature radius R3 (for example, about 1/2 to 1/6 of the curvature radius R2) smaller than the curvature radius R2. Is preferred. Furthermore, in the inclination relaxation line part 262, the inclination at the connection point between the first line part 262a and the second line part 262b (the inclination of the tangent line at the connection point) is zero (parallel to the width direction).

なお、端線部２６３（幅方向における区間Ｓ３に対応）は、傾斜緩和線部２６２の第２線部２６２ｂから続いて立ち上がった位置に形成されており、第２線部２６２ｂと同じ曲率半径Ｒ3の円弧状の凹状部分と、その凹状部分に滑らかに続く円弧状（前記曲率半径Ｒ3より小さい曲率半径）の凸状部分と、その凸状部分に滑らかに続くサイドシール部２１ａの外側縁まで延びる直線部分とによって構成されている。   Note that the end line part 263 (corresponding to the section S3 in the width direction) is formed at a position rising from the second line part 262b of the inclined relaxation line part 262, and has the same radius of curvature R3 as the second line part 262b. The arc-shaped concave portion, the convex portion having an arc shape (curvature radius smaller than the curvature radius R3) smoothly following the concave portion, and the outer edge of the side seal portion 21a smoothly following the convex portion. It is comprised by the linear part.

サイドシール部２１ａの内側縁線２２ａは、底シール部２５の内側縁線２６と、傾斜緩和線部２６２（図７における区間Ｓ２に対応）において交差している。更に、具体的には、サイドシール部２１ａの内側縁線２２ａと底シール部２５の内側縁線２６との交点Ｐａは、底シール部２５の傾斜緩和線部２６２における第１線部２６２ａと第２線部２６２ｂとの接続点に略一致している。また、底フィルム１３の山折り線１３ｃは、サイドシール部２１ａの内側縁線２２ａと底シール部２５の内側縁線２６との交点Ｐａを通っている。   The inner edge line 22a of the side seal portion 21a intersects with the inner edge line 26 of the bottom seal portion 25 at the inclined relaxation line portion 262 (corresponding to the section S2 in FIG. 7). More specifically, the intersection Pa between the inner edge line 22a of the side seal portion 21a and the inner edge line 26 of the bottom seal portion 25 is equal to the first line portion 262a in the inclined relaxation line portion 262 of the bottom seal portion 25. It substantially coincides with the connection point with the two-wire portion 262b. Further, the mountain fold line 13 c of the bottom film 13 passes through the intersection Pa between the inner edge line 22 a of the side seal portion 21 a and the inner edge line 26 of the bottom seal portion 25.

なお、前述したサイドシール部２１ａの内側縁線２２ａと逆側のサイドシール部２１ｂの内側縁線２２ｂ（図６参照）と、底シール部２５の内側縁線２６と、底フィルム１３の山折り線１３ｃとの関係も、前述したサイドシール部２１ａの内側縁線２２ａの場合と同様である。   In addition, the inner edge line 22b (see FIG. 6) of the side seal portion 21b opposite to the inner edge line 22a of the side seal portion 21a described above, the inner edge line 26 of the bottom seal portion 25, and the mountain fold of the bottom film 13 The relationship with the line 13c is the same as in the case of the inner edge line 22a of the side seal portion 21a described above.

本実施形態の自立型パウチ１０は、前述した自立型パウチ（図１〜図３参照）と同様に、図４に示す製造工程によって製造される。   The self-standing pouch 10 of the present embodiment is manufactured by the manufacturing process shown in FIG. 4 in the same manner as the above-described self-standing pouch (see FIGS. 1 to 3).

即ち、プラスチックフィルムの原反から切り出された表用長尺フィルム１０１と裏用長尺フィルム１０２との間に、底フィルム１３の原材料となるプラスチックフィルムの２つ折りされた底用長尺フィルム１０３が挟まれた状態で、それら表用長尺フィルム１０１、裏用長尺フィルム１０２及び底用長尺フィルム１０３が順次搬送される。この状態で、一対の底シールバー（５０ａ、５０ｂ）が表用長尺フィルム１０１、裏用長尺フィルム１０２及び底用長尺フィルム１０３の所定部位を挟み込んで、それらを加圧加熱してシールすることにより所定形状の底シール部（図６における底シール部２５（２５ａ、２５ｂ）に対応）が形成される（底シール工程）。   That is, the bottom long film 103 of the plastic film which is the raw material of the bottom film 13 is folded between the front long film 101 and the back long film 102 cut out from the plastic film raw fabric. While being sandwiched, the front long film 101, the back long film 102, and the bottom long film 103 are sequentially conveyed. In this state, a pair of bottom seal bars (50a, 50b) sandwich predetermined portions of the front long film 101, the back long film 102, and the bottom long film 103 and pressurize and heat them to seal. Thus, a bottom seal portion having a predetermined shape (corresponding to the bottom seal portions 25 (25a, 25b) in FIG. 6) is formed (bottom seal step).

そして、底シールバー対５０ａ、５０ｂの下流側に設けられた２対のサイドシールバー（５１ａ、５１ｂ）、（５２ａ、５２ｂ）が、表用長尺フィルム１０１及び裏用長尺フィルム１０２を加圧加熱してシールすることにより所定幅のサイドシール部（図６における幅ｗのサイドシール部２１ａ、２１ｂの２倍の幅２ｗ）が形成される（サイドシール工程）。次いで、２対のサイドシールバー（５１ａ、５１ｂ）、（５２ａ、５２ｂ）の下流側に配置されたカッター装置５３によってサイドシール部分をカットすることにより、前述した形態（図６、図７参照）の自立型パウチ１０が切り出される（カッター工程）。   Then, two pairs of side seal bars (51a, 51b), (52a, 52b) provided on the downstream side of the bottom seal bar pair 50a, 50b add the front long film 101 and the back long film 102. A side seal portion having a predetermined width (a width 2w that is twice the width of the side seal portions 21a and 21b in FIG. 6) is formed by sealing with pressure heating (side seal step). Next, by cutting the side seal portion with the cutter device 53 disposed downstream of the two pairs of side seal bars (51a, 51b) and (52a, 52b), the above-described configuration (see FIGS. 6 and 7). The self-standing pouch 10 is cut out (cutter process).

図８及び図９は、前記一対の底シールバー５０ａ、５０ｂの加熱部５００を示し、図８において、加熱部５００は、自立型パウチ１０の底シール部２５に対応した形状となっており、底シール部２５の内側縁線２６に対応した内側シール縁線５１０を有している。内側シール縁線５１０は、中心Ｃから外側Ｄoutに向けて連続する立ち上がり傾斜シール線部５１１（幅方向における区間Ｄ１に対応）、立ち上がり傾斜シール線部５１１に滑らかに続く傾斜緩和シール線部５１２（幅方向における区間Ｄ２に対応）及び傾斜緩和シール線部５１２に滑らかに続く端シール線部５１３（幅方向における区間Ｄ３に対応）からなっている。   8 and 9 show the heating part 500 of the pair of bottom seal bars 50a and 50b. In FIG. 8, the heating part 500 has a shape corresponding to the bottom seal part 25 of the self-standing pouch 10, An inner seal edge line 510 corresponding to the inner edge line 26 of the bottom seal portion 25 is provided. The inner seal edge line 510 includes a rising inclined seal line portion 511 (corresponding to the section D1 in the width direction) continuous from the center C toward the outer side Dout, and an inclination relaxing seal line portion 512 (smoothly following the rising inclined seal line portion 511). And an end seal line portion 513 (corresponding to the interval D3 in the width direction) smoothly following the inclined relaxation seal line portion 512.

立ち上がり傾斜シール線部５１１は、前述した自立型パウチ１０における底シール部２５の内側縁線２６の立ち上がり傾斜線部２６１（図７参照）に対応しており、曲率半径Ｒ1の円弧状（それに続く直線を含んでもよい）凹形状になっている。傾斜緩和シール線部５１２は、前述した自立型パウチ１０における底シール部２５（内側線部２６）の傾斜緩和線部２６２に対応しており、第１線部２６２ａに対応した曲率半径Ｒ2の円弧状の凸形状となる第１シール線部５１２ａ（幅方向における区間Ｄ2aに対応）と、第２線部２６２ｂに対応した曲率半径Ｒ3の円弧状の凹形状となる第２シール線部５１２ｂ（幅方向における区間Ｄ2bに対応）とから成っている。   The rising inclined seal line portion 511 corresponds to the rising inclined line portion 261 (see FIG. 7) of the inner edge line 26 of the bottom seal portion 25 in the self-standing pouch 10 described above, and has an arc shape with a curvature radius R1 (following that). It may be a straight line). The inclination relaxation seal line portion 512 corresponds to the inclination relaxation line portion 262 of the bottom seal portion 25 (inner line portion 26) in the above-described self-standing pouch 10, and has a radius of curvature R2 corresponding to the first line portion 262a. A first seal line portion 512a (corresponding to the section D2a in the width direction) having an arcuate convex shape and a second seal line portion 512b (width) having an arcuate concave shape having a radius of curvature R3 corresponding to the second line portion 262b. Corresponding to the section D2b in the direction).

なお、底シールバー５０ａ、５０ｂの加熱部５００には、プラスチックフィルムを加圧加熱する際に発生する気泡の逃げ場所となる複数の凹部５０１ａ、５０１ｂ，５０２ａ、５０２ｂ、５０３ａ、５０３ｂが形成されている。   In addition, a plurality of recesses 501a, 501b, 502a, 502b, 503a, and 503b are formed in the heating unit 500 of the bottom seal bars 50a and 50b, which serve as escape places for bubbles generated when the plastic film is pressurized and heated. Yes.

前述した加熱部５００（図８、図９参照）を有する底シールバー５０ａ、５０ｂで、表用長尺フィルム１０１（表側フィルム１１）、裏用長尺フィルム１０２（裏側フィルム１２）及び底用長尺フィルム１０３（底フィルム１３）を挟み込んで加圧加熱することにより、前述した内側縁線２６（２６ａ、２６ｂ）を有する底シール部２５（２５ａ、２５ｂ）（図６、図７参照）を、自立型パウチ１０に形成することができる。   With the bottom seal bars 50a and 50b having the heating section 500 (see FIGS. 8 and 9), the front long film 101 (front side film 11), the back long film 102 (back side film 12), and the bottom length The bottom seal portion 25 (25a, 25b) having the inner edge line 26 (26a, 26b) described above (see FIGS. 6 and 7) is obtained by sandwiching the length film 103 (bottom film 13) and heating with pressure. A self-standing pouch 10 can be formed.

自立型パウチ１０における底シール部２５の内側縁線２６の傾斜緩和線部２６２の形状及び範囲（図７の区間Ｓ２）は、プラスチックフィルムの原反の想定される伸縮量の変動範囲、即ち、サイドシール部２１ａ（２１ｂ）の内側縁線２２ａ（２２ｂ）の位置の変動範囲に基づいて決められる。具体的には、サイドシール部２１ａ（２１ｂ）の内側縁線２２ａ（２２ｂ）の位置の変動範囲が底シール部２５の内側縁線２６の傾斜緩和線部２６２の範囲（区間Ｓ２）に収まるように、当該傾斜緩和線部２６２の形状及び範囲が決められる。即ち、底シールバー５０ａ、５０ｂの加熱部５００の形状（図８、図９参照）は、内側シール縁線５１０がそのような傾斜緩和部２６２に対応した傾斜緩和シール線部５１２を有する形状に決められる。   The shape and range of the slope relaxation line portion 262 of the inner edge line 26 of the bottom seal portion 25 in the self-supporting pouch 10 (section S2 in FIG. 7) is a variation range of an expected expansion / contraction amount of the original film of the plastic film, that is, It is determined based on the fluctuation range of the position of the inner edge line 22a (22b) of the side seal portion 21a (21b). Specifically, the fluctuation range of the position of the inner edge line 22a (22b) of the side seal portion 21a (21b) is within the range (section S2) of the inclined relaxation line portion 262 of the inner edge line 26 of the bottom seal portion 25. In addition, the shape and range of the inclined relaxation line portion 262 are determined. That is, the shape of the heating part 500 of the bottom seal bars 50a and 50b (see FIGS. 8 and 9) is such that the inner seal edge line 510 has an inclination relaxing seal line part 512 corresponding to such an inclination relaxing part 262. It is decided.

その結果、図１０に示すように、サイドシール部２１ａ（２１ｂ）の内側縁線２２ａ（２２ｂ）の位置が、プラスチックフィルムの原反の収縮により底シール部２５の内側縁線２６の傾斜緩和線部２６２の範囲（区間Ｓ２）で変化したとしても、サイドシール部２１ａ（２１ｂ）の内側縁線２２ａ（２２ｂ）と、底シール部２５の内側縁線２６との交点を通るべき底フィルム１３の山折り線１３ｃの調整範囲は、傾斜緩和線部２６２の比較的小さい傾き（立ち上がり傾斜線部２６１との接続点での傾きより小さい）に応じた程度の範囲Δ１に抑えられる。   As a result, as shown in FIG. 10, the position of the inner edge line 22a (22b) of the side seal portion 21a (21b) is the inclination relaxation line of the inner edge line 26 of the bottom seal portion 25 due to the shrinkage of the original plastic film. Even if it changes in the range of the part 262 (section S2), the bottom film 13 that should pass through the intersection of the inner edge line 22a (22b) of the side seal part 21a (21b) and the inner edge line 26 of the bottom seal part 25 The adjustment range of the mountain fold line 13c is suppressed to a range Δ1 of a degree corresponding to a relatively small inclination of the inclination relaxing line portion 262 (smaller than an inclination at a connection point with the rising inclination line portion 261).

これに対して、従来の自立型パウチ１０（図２参照）の場合は、図１０に示すように、サイドシール部２１ａ（２１ｂ）の内側縁線２２ａ（２２ｂ）の位置が、前述した傾斜緩和傾部２６２の範囲（区間Ｓ２）と同様の範囲で変化すると、サイドシール部２１ａ（２１ｂ）の内側縁線２２ａ（２２ｂ）と、底シール部２３の内側縁線２４（図１０おける凹状破線曲線）との交点を通るべき底フィルム１３の山折り線１３ｃの調整範囲は、前記範囲Δ１より大きい範囲Δ２になってしまう。   On the other hand, in the case of the conventional self-supporting pouch 10 (see FIG. 2), as shown in FIG. 10, the position of the inner edge line 22a (22b) of the side seal portion 21a (21b) is inclined as described above. When changing in the same range as the range of the inclined portion 262 (section S2), the inner edge line 22a (22b) of the side seal portion 21a (21b) and the inner edge line 24 of the bottom seal portion 23 (concave broken line curve in FIG. 10). The adjustment range of the mountain fold line 13c of the bottom film 13 that should pass through the intersection with the above) is a range Δ2 that is larger than the range Δ1.

更に、図１１に示すように、サイドシール部２１ａ（２１ｂ）の内側縁線２２ａ（２２ｂ）の位置の実際の変動範囲がＳｘである場合、内側縁線２２ａ（２２ｂ）と底シール部２５の内側縁線２６との交点Ｐａの位置は、第１線部２６２ａ（区間Ｓ2a）と第２線部２６２ｂ（区間Ｓ2b）との接続点（傾きゼロ）及びその所定近傍である前記Ｓｘの範囲に収まる。そして、前記Ｓｘの範囲では底シール部２５の傾斜緩和線部２６２の傾きがゼロまたはゼロに極めて近い値になっているので、サイドシール部２１ａ（２１ｂ）の内側縁線２２ａ（２２ｂ）と底シール部２５の内側縁線２６との交点を通るべき底フィルム１３の山折り線１３ｃの調整範囲は、極めて僅かな範囲であり、ラインを止めて底フィルム１３の山折り線１３ｃの位置を再調整する必要はない。これに対して、従来の自立型パウチ１０（図２参照）では、サイドシール部２１ａ（２１ｂ）の内側縁線２２ａ（２２ｂ）の位置が、前記範囲Ｓｘで変動すると、サイドシール部２１ａ（２１ｂ）の内側縁線２２ａ（２２ｂ）と底シール部２３の内側縁線２４との交点の変動が範囲Δ２と大きくなり、ラインを止めて底フィルム１３の山折り線１３ｃの位置を再調整しなければならないおそれがある。   Furthermore, as shown in FIG. 11, when the actual fluctuation range of the position of the inner edge line 22a (22b) of the side seal portion 21a (21b) is Sx, the inner edge line 22a (22b) and the bottom seal portion 25 The position of the intersection Pa with the inner edge line 26 is within the range of Sx that is the connection point (zero inclination) between the first line part 262a (section S2a) and the second line part 262b (section S2b) and its predetermined vicinity. It will fit. In the range of Sx, since the inclination of the inclination relaxation line portion 262 of the bottom seal portion 25 is zero or very close to zero, the inner edge line 22a (22b) of the side seal portion 21a (21b) and the bottom The adjustment range of the mountain fold line 13c of the bottom film 13 that should pass through the intersection with the inner edge line 26 of the seal portion 25 is very slight. The line is stopped and the position of the mountain fold line 13c of the bottom film 13 is restored. There is no need to adjust. On the other hand, in the conventional self-standing pouch 10 (see FIG. 2), when the position of the inner edge line 22a (22b) of the side seal portion 21a (21b) varies within the range Sx, the side seal portion 21a (21b ) Of the inner edge line 22a (22b) of the bottom seal portion 23 and the inner edge line 24 of the bottom seal portion 23 is increased to a range Δ2, and the line is stopped and the position of the mountain fold line 13c of the bottom film 13 must be readjusted. There is a risk of having to.

前述したように、図６及び図７に示すような自立型パウチ１０によれば、サイドシール部２１ａ（２１ｂ）の内側縁線２２ａ（２２ｂ）の位置の変化に起因して、当該サイドシール部２１ａ（２１ｂ）の内側縁線２２ａ（２２ｂ）と底シール部２５の内側縁線２６との交点の位置が変化したとしても、その交点と底フィルム１３の山折り線１３ｃとの間の間隔長の変化は、傾斜緩和線部２６２の比較的小さい傾き（図１１の範囲Ｓｘの場合、傾きが略ゼロ）に応じた程度の変化に抑えられるので、サイドシール部２１ａ（２１ｂ）の内側縁線２２ａ（２２ｂ）と底シール部２５の内側縁線２６との交点の変化に対して底フィルム１３の山折り線１３ｃの位置を調整する必要がなくなる。よって、ラインを止めて調整する時間が削減され、作業者の負担も少なくなり、自立型パウチ１０（袋体）の生産効率が大幅に向上する。   As described above, according to the self-standing pouch 10 as shown in FIGS. 6 and 7, the side seal portion is caused by the change in the position of the inner edge line 22a (22b) of the side seal portion 21a (21b). Even if the position of the intersection of the inner edge line 22a (22b) of 21a (21b) and the inner edge line 26 of the bottom seal portion 25 changes, the distance between the intersection and the mountain fold line 13c of the bottom film 13 Is suppressed to a change corresponding to a relatively small inclination of the inclination relaxation line portion 262 (in the case of the range Sx in FIG. 11, the inclination is substantially zero), the inner edge line of the side seal portion 21a (21b) It is not necessary to adjust the position of the mountain fold line 13c of the bottom film 13 with respect to the change of the intersection of 22a (22b) and the inner edge line 26 of the bottom seal portion 25. Therefore, the time for stopping and adjusting the line is reduced, the burden on the operator is reduced, and the production efficiency of the self-supporting pouch 10 (bag body) is greatly improved.

なお、底シール部２５の内側縁線２６における傾斜緩和線部２６２を構成する第１線部２６２ａ及び第２線部２６２ｂは、円弧状でなくてもよい。また、第２線部２６２ｂの曲率半径Ｒ3は、第１線部２６２ａの曲率半径Ｒ2と同じであっても、大きくても（第２線部２６２ｂが直線であることを表す無限大も含む）よい。ただし、第１線部２６２ａから滑らかに続いてくる第２線部２６２ｂは、より小さい曲率半径にて急激に立ち上がって端線部２６３に続くことが、底シール部２５において端線部２６３によって形成されるサイドシール部２１ａと重なる突出部分をより広くして確実なシール性を確保するという点で好ましい。   In addition, the 1st line part 262a and the 2nd line part 262b which comprise the inclination relaxation line part 262 in the inner edge line 26 of the bottom seal part 25 may not be circular arc shape. Further, the radius of curvature R3 of the second line portion 262b may be the same as or larger than the radius of curvature R2 of the first line portion 262a (including infinity indicating that the second line portion 262b is a straight line). Good. However, the second line portion 262b that smoothly continues from the first line portion 262a suddenly rises with a smaller radius of curvature and continues to the end line portion 263 by the end line portion 263 in the bottom seal portion 25. It is preferable in terms of securing a reliable sealing property by widening the protruding portion overlapping the side seal portion 21a.

本発明に係る袋体は、サイドシール部の内側縁線と底シール部の内側縁線との交点の位置の変化に対して、底フィルムの山折り線の位置の調整をできるだけ小さくすることができる構造であり、表側フィルムと、裏側フィルムと、該表側フィルムと該裏側フィルムとの間に２つ折りして挟まれた底フィルムとを有する自立型パウチ等の袋体として有用である。   The bag according to the present invention can minimize the adjustment of the position of the mountain fold line of the bottom film with respect to the change in the position of the intersection of the inner edge line of the side seal portion and the inner edge line of the bottom seal portion. It is a structure that can be used, and is useful as a bag body such as a self-standing pouch having a front side film, a back side film, and a bottom film sandwiched between the front side film and the back side film.

１０ 自立型パウチ（袋体）
１１ 表側フィルム
１２ 裏側フィルム
１３ 底フィルム
１３ａ、１３ｂ 折り片
１３ｃ 山折り線
２１ａ、２１ｂ サイドシール部
２２ａ、２２ｂ 内側縁線
２３（２３ａ、２３ｂ） 底シール部
２４（２４ａ、２４ｂ） 内側縁線
２５（２５ａ、２５ｂ） 底シール部
２６（２６ａ、２６ｂ） 内側縁線
５０ａ、５０ｂ 底シールバー
５１ａ、５１ｂ、５２ａ、５２ｂ サイドシールバー
２６１ 立ち上がり傾斜線部
２６２ 傾斜緩和線部
２６２ａ 第１線部
２６２ｂ 第２線部
２６３ 端線部
５００ 加熱部
５１０ 内側シール縁線
５１１ 立ち上がり傾斜シール線部
５１２ 傾斜緩和シール線部
５１２ａ 第１シール線部
５１２ｂ 第２シール線部
５１３ 端シール線部 10 Freestanding pouch (bag)
11 Front side film 12 Back side film 13 Bottom film 13a, 13b Folded piece 13c Mountain fold line 21a, 21b Side seal part 22a, 22b Inner edge line 23 (23a, 23b) Bottom seal part 24 (24a, 24b) Inner edge line 25 ( 25a, 25b) Bottom seal part 26 (26a, 26b) Inner edge line 50a, 50b Bottom seal bar 51a, 51b, 52a, 52b Side seal bar 261 Rising inclined line part 262 Inclined relaxation line part 262a First line part 262b Second Line part 263 End line part 500 Heating part 510 Inner seal edge line 511 Rising inclined seal line part 512 Inclination relaxation seal line part 512a First seal line part 512b Second seal line part 513 End seal line part

Claims (9)

表側フィルムと、裏側フィルムと、該表側フィルムと該裏側フィルムとの間に２つ折りして挟まれた底フィルムとを有し、２つ折りした状態の前記底フィルムと前記表側フィルム及び前記裏側フィルムのそれぞれとをシールして形成される所定形状の底シール部と、前記表側フィルム及び前記裏側フィルムの両サイドのそれぞれをシールして形成された所定形状のサイドシール部とによって袋状に形成された袋体であって、
前記底シール部の内側縁線は、前記底フィルムの幅方向における中央部から外側に向かって立ち上がる立ち上がり傾斜線部と、前記立ち上がり傾斜線部に続く傾斜緩和線部とを有し、
該傾斜緩和線部の各点での接線の前記中央部から外側に向かう方向の傾きは、前記立ち上がり傾斜線部と当該傾斜緩和線部との接続点での接線の前記中央部から外側に向う方向の傾きより小さく、
前記サイドシール部の内側縁線は、前記底シール部の前記内側縁線と、前記傾斜緩和線部において交差する袋体。 A front-side film, a back-side film, and a bottom film sandwiched between the front-side film and the back-side film. The bottom film, the front-side film, and the back-side film in a folded state Each was formed into a bag shape by a bottom seal portion having a predetermined shape formed by sealing each other, and a side seal portion having a predetermined shape formed by sealing each of both sides of the front side film and the back side film. A bag,
The inner edge line of the bottom seal part has a rising slope line part that rises outward from the center part in the width direction of the bottom film, and an inclination relaxation line part that follows the rising slope line part,
The inclination of the tangent line at each point of the slope relaxation line part in the direction from the center to the outside is directed outward from the center part of the tangent line at the connection point between the rising slope line part and the slope relaxation line part. Smaller than the inclination of the direction,
The inner edge line of the side seal portion intersects the inner edge line of the bottom seal portion at the inclined relaxation line portion. 前記立ち上がり傾斜線部は、凹形状であり、
前記傾斜緩和線部は、前記凹形状の立ち上がり傾斜線部に滑らかに続く凸形状の第１線部を有する請求項１記載の袋体。 The rising slope line part is concave,
The bag according to claim 1, wherein the slope relaxation line portion has a convex first line portion that smoothly follows the concave rising slope line portion. 前記傾斜緩和線部は、更に、前記第１線部に滑らかに続く凹形状の第２線部を有する請求項２記載の袋体。   The bag according to claim 2, wherein the inclined relaxation line portion further includes a concave second line portion that smoothly follows the first line portion. 前記第１線部と前記第２線部との接続点での接線の傾きがゼロである請求項３記載の袋体。   The bag body according to claim 3, wherein a slope of a tangent at a connection point between the first line portion and the second line portion is zero. 前記サイドシール部の前記内側縁線は、前記底シール部の前記内側縁線と、前記傾斜緩和線部の前記第１線部と前記第２線部との接続点及びその所定近傍において交差する請求項４記載の袋体。   The inner edge line of the side seal portion intersects the inner edge line of the bottom seal portion, the connection point between the first line portion and the second line portion of the inclined relaxation line portion, and a predetermined vicinity thereof. The bag according to claim 4. 前記第１線部は、第１曲率半径を有する円弧状であり、
前記第２線部は、前記第１曲率半径より小さい第２曲率半径を有する円弧状である請求項３乃至５のいずれかに記載の袋体。 The first line portion has an arc shape having a first radius of curvature;
The bag according to any one of claims 3 to 5, wherein the second line portion has an arc shape having a second radius of curvature smaller than the first radius of curvature. 請求項１乃至６のいずれかに記載の袋体を製造する袋体製造装置であって、
前記袋体の前記底シール部を形成する底シールバーと、
前記袋体の前記サイドシール部を形成するサイドシールバーとを有し、
前記底シールバーは、前記底シール部の前記立ち上がり傾斜線部に対応する立ち上がり傾斜シール線部と、該立ち上がり傾斜シール線部に続く前記底シール部の前記傾斜緩和線部に対応する傾斜緩和シール線部とを有し、
前記サイドシールバーは、当該サイドシールバーにて形成される前記袋体における前記サイドシール部の内側縁線が、前記底シールバーにて形成される前記底シール部の内側縁線と、前記傾斜緩和線部にて交差するようにセットされる袋体製造装置。 A bag manufacturing apparatus for manufacturing the bag according to any one of claims 1 to 6,
A bottom seal bar forming the bottom seal portion of the bag body;
A side seal bar that forms the side seal portion of the bag,
The bottom seal bar includes a rising inclined seal line portion corresponding to the rising inclined line portion of the bottom seal portion, and an inclination relaxing seal corresponding to the inclined relaxation line portion of the bottom seal portion following the rising inclined seal line portion. And having a line part,
The side seal bar has an inner edge line of the side seal portion in the bag body formed by the side seal bar, an inner edge line of the bottom seal portion formed by the bottom seal bar, and the inclination The bag manufacturing apparatus set so that it may cross | intersect in a relaxation line part. 請求項１乃至６のいずれかに記載の袋体を製造する袋体製造装置において前記袋体の前記底シール部を形成する底シールバーであって、
前記底シール部の前記立ち上がり傾斜線部に対応する立ち上がり傾斜シール線部と、
該立ち上がり傾斜シール線部に続く前記底シール部の前記傾斜緩和線部に対応する傾斜緩和シール線部とを有する底シールバー。 A bottom seal bar for forming the bottom seal portion of the bag body in the bag body manufacturing apparatus for manufacturing the bag body according to any one of claims 1 to 6,
A rising inclined seal line portion corresponding to the rising inclined line portion of the bottom seal portion;
A bottom seal bar having an inclination relaxation seal line portion corresponding to the inclination relaxation line portion of the bottom seal portion following the rising inclination seal line portion. 表側フィルムと、裏側フィルムと、該表側フィルムと該裏側フィルムとの間に２つ折りして挟まれた底フィルムとを有する袋体を製造する方法であって、
２つ折りした状態の前記底フィルムと前記表側フィルム及び前記裏側フィルムのそれぞれとをシールして所定形状の底シール部を形成する底シール工程と、
前記表側フィルム及び前記裏側フィルムの両サイドのそれぞれをシールして所定形状のサイドシール部を形成するサイドシール工程とを有し、
前記底シール工程は、内側縁線が、前記底フィルムの幅方向における中央部から外側に向かって立ち上がる立ち上がり傾斜線部と、前記立ち上がり傾斜線部に続く傾斜緩和線部とを有し、該傾斜緩和線部の各点での接線の前記中央部から外側に向かう方向の傾きが前記立ち上がり傾斜線部と当該傾斜緩和線部との接続点での接線の前記中央部から外側に向かう方向の傾きより小さい前記底シール部を形成し、
前記サイドシール工程は、内側縁線が、前記底シール部の前記内側縁線と、前記傾斜緩和線部において交差する前記サイドシール部を形成する、袋体の製造方法。 A method of manufacturing a bag having a front film, a back film, and a bottom film sandwiched between the front film and the back film,
A bottom sealing step of sealing the bottom film in a folded state and each of the front side film and the back side film to form a bottom seal portion of a predetermined shape;
A side sealing step of sealing each of both sides of the front film and the back film to form a side seal portion of a predetermined shape,
The bottom sealing step includes a rising slope line portion where an inner edge line rises outward from a center portion in the width direction of the bottom film, and an inclination relaxation line portion following the rising slope line portion, The inclination of the tangent line at each point of the relaxation line part in the direction from the center part to the outside is the inclination of the tangent line at the connection point between the rising slope line part and the slope relaxation line part in the direction from the center part to the outside. Forming a smaller bottom seal portion,
The said side seal process is a manufacturing method of a bag body in which the inner edge line forms the said side seal part which cross | intersects the said inner edge line of the said bottom seal part in the said inclination relaxation line part.
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